1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2d73e60b7SRussell King /*
3d73e60b7SRussell King * linux/arch/arm/mm/copypage-xsc3.S
4d73e60b7SRussell King *
5d73e60b7SRussell King * Copyright (C) 2004 Intel Corp.
6d73e60b7SRussell King *
7d73e60b7SRussell King * Adapted for 3rd gen XScale core, no more mini-dcache
8d73e60b7SRussell King * Author: Matt Gilbert (matthew.m.gilbert@intel.com)
9d73e60b7SRussell King */
10d73e60b7SRussell King #include <linux/init.h>
11063b0a42SRussell King #include <linux/highmem.h>
12d73e60b7SRussell King
13d73e60b7SRussell King /*
14d73e60b7SRussell King * General note:
15d73e60b7SRussell King * We don't really want write-allocate cache behaviour for these functions
16d73e60b7SRussell King * since that will just eat through 8K of the cache.
17d73e60b7SRussell King */
18d73e60b7SRussell King
19d73e60b7SRussell King /*
20063b0a42SRussell King * XSC3 optimised copy_user_highpage
21d73e60b7SRussell King *
22d73e60b7SRussell King * The source page may have some clean entries in the cache already, but we
23d73e60b7SRussell King * can safely ignore them - break_cow() will flush them out of the cache
24d73e60b7SRussell King * if we eventually end up using our copied page.
25d73e60b7SRussell King *
26d73e60b7SRussell King */
xsc3_mc_copy_user_page(void * kto,const void * kfrom)27b99afae1SNicolas Pitre static void xsc3_mc_copy_user_page(void *kto, const void *kfrom)
28d73e60b7SRussell King {
29b99afae1SNicolas Pitre int tmp;
30b99afae1SNicolas Pitre
31b99afae1SNicolas Pitre asm volatile ("\
32*c8a91428SArnd Bergmann .arch xscale \n\
33b99afae1SNicolas Pitre pld [%1, #0] \n\
34b99afae1SNicolas Pitre pld [%1, #32] \n\
35b99afae1SNicolas Pitre 1: pld [%1, #64] \n\
36b99afae1SNicolas Pitre pld [%1, #96] \n\
37d73e60b7SRussell King \n\
38bc2eca9aSNicolas Pitre 2: ldrd r2, r3, [%1], #8 \n\
39bc2eca9aSNicolas Pitre ldrd r4, r5, [%1], #8 \n\
40b99afae1SNicolas Pitre mcr p15, 0, %0, c7, c6, 1 @ invalidate\n\
41bc2eca9aSNicolas Pitre strd r2, r3, [%0], #8 \n\
42bc2eca9aSNicolas Pitre ldrd r2, r3, [%1], #8 \n\
43bc2eca9aSNicolas Pitre strd r4, r5, [%0], #8 \n\
44bc2eca9aSNicolas Pitre ldrd r4, r5, [%1], #8 \n\
45bc2eca9aSNicolas Pitre strd r2, r3, [%0], #8 \n\
46bc2eca9aSNicolas Pitre strd r4, r5, [%0], #8 \n\
47bc2eca9aSNicolas Pitre ldrd r2, r3, [%1], #8 \n\
48bc2eca9aSNicolas Pitre ldrd r4, r5, [%1], #8 \n\
49b99afae1SNicolas Pitre mcr p15, 0, %0, c7, c6, 1 @ invalidate\n\
50bc2eca9aSNicolas Pitre strd r2, r3, [%0], #8 \n\
51bc2eca9aSNicolas Pitre ldrd r2, r3, [%1], #8 \n\
52b99afae1SNicolas Pitre subs %2, %2, #1 \n\
53bc2eca9aSNicolas Pitre strd r4, r5, [%0], #8 \n\
54bc2eca9aSNicolas Pitre ldrd r4, r5, [%1], #8 \n\
55bc2eca9aSNicolas Pitre strd r2, r3, [%0], #8 \n\
56bc2eca9aSNicolas Pitre strd r4, r5, [%0], #8 \n\
57d73e60b7SRussell King bgt 1b \n\
58b99afae1SNicolas Pitre beq 2b "
59b99afae1SNicolas Pitre : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
60b99afae1SNicolas Pitre : "2" (PAGE_SIZE / 64 - 1)
61b99afae1SNicolas Pitre : "r2", "r3", "r4", "r5");
62d73e60b7SRussell King }
63d73e60b7SRussell King
xsc3_mc_copy_user_highpage(struct page * to,struct page * from,unsigned long vaddr,struct vm_area_struct * vma)64063b0a42SRussell King void xsc3_mc_copy_user_highpage(struct page *to, struct page *from,
65f00a75c0SRussell King unsigned long vaddr, struct vm_area_struct *vma)
66063b0a42SRussell King {
67063b0a42SRussell King void *kto, *kfrom;
68063b0a42SRussell King
695472e862SCong Wang kto = kmap_atomic(to);
705472e862SCong Wang kfrom = kmap_atomic(from);
712725898fSRussell King flush_cache_page(vma, vaddr, page_to_pfn(from));
72063b0a42SRussell King xsc3_mc_copy_user_page(kto, kfrom);
735472e862SCong Wang kunmap_atomic(kfrom);
745472e862SCong Wang kunmap_atomic(kto);
75063b0a42SRussell King }
76063b0a42SRussell King
77d73e60b7SRussell King /*
78d73e60b7SRussell King * XScale optimised clear_user_page
79d73e60b7SRussell King */
xsc3_mc_clear_user_highpage(struct page * page,unsigned long vaddr)80303c6443SRussell King void xsc3_mc_clear_user_highpage(struct page *page, unsigned long vaddr)
81d73e60b7SRussell King {
825472e862SCong Wang void *ptr, *kaddr = kmap_atomic(page);
8343ae286bSNicolas Pitre asm volatile ("\
84*c8a91428SArnd Bergmann .arch xscale \n\
8543ae286bSNicolas Pitre mov r1, %2 \n\
86d73e60b7SRussell King mov r2, #0 \n\
87d73e60b7SRussell King mov r3, #0 \n\
88303c6443SRussell King 1: mcr p15, 0, %0, c7, c6, 1 @ invalidate line\n\
89bc2eca9aSNicolas Pitre strd r2, r3, [%0], #8 \n\
90bc2eca9aSNicolas Pitre strd r2, r3, [%0], #8 \n\
91bc2eca9aSNicolas Pitre strd r2, r3, [%0], #8 \n\
92bc2eca9aSNicolas Pitre strd r2, r3, [%0], #8 \n\
93d73e60b7SRussell King subs r1, r1, #1 \n\
94303c6443SRussell King bne 1b"
9543ae286bSNicolas Pitre : "=r" (ptr)
9643ae286bSNicolas Pitre : "0" (kaddr), "I" (PAGE_SIZE / 32)
97303c6443SRussell King : "r1", "r2", "r3");
985472e862SCong Wang kunmap_atomic(kaddr);
99d73e60b7SRussell King }
100d73e60b7SRussell King
101d73e60b7SRussell King struct cpu_user_fns xsc3_mc_user_fns __initdata = {
102303c6443SRussell King .cpu_clear_user_highpage = xsc3_mc_clear_user_highpage,
103063b0a42SRussell King .cpu_copy_user_highpage = xsc3_mc_copy_user_highpage,
104d73e60b7SRussell King };
105